Motorcycle 1980 Honda CB 750 battery problem?

Motorcycle 1980 Honda CB 750 battery problem?!

Added (1). I bought a 1980 Honda CB 750 motorcycle and the battery died. I put another motorcycle battery, but it died as well. I used my car battery after that, but it also died. It is not the battery. I checked the alternator brushes and they look long enough. What could it be?

You don't check a charging system by looking at it, you check it with a volt meter.

Quite apparently your battery is not charging and that would be alternator or regulator/rectifier.

First of all you need to check the voltage going to the battery from the rectifier/alternator, should read 12.3 -13.5.
Been a long time since working on either the 650 or the 750 but I seem to recall there being a relay up/near by where the battery case is, it may be that relay as that is what went wrong on my 650.

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